 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.help;

 import org.eclipse.swt.events.HelpEvent;

 /**
  * A content computer is used to dynamically calculate help support contexts at the
  * time the user requests help.
  * <p>
  * This interface may be implemented by clients.
  * </p>
  * @deprecated nested contexts are no longer supported by the help support system
  *
  */
 public interface IContextComputer {
     /**
      * Computes contexts for the help system.
      *
      * @param event the help event which triggered this request for help
      * @return a mixed-type array of context ids (type <code>String</code>)
      * and/or help contexts (type <code>IContext</code>)
      * @see org.eclipse.help.IContext
      */
     public Object [] computeContexts(HelpEvent event);

     /**
      * Returns the local contexts for this context computer.
      * <p>
      * Typically this method is called by other instances of
      * <code>IContextComputer</code> in their <code>computeContexts</code>
      * method.
      * </p>
      * <p>
      * The important concept here is that the value returned by
      * <code>computeContexts</code> represents the complete help
      * contexts and is passed directly to the help support system.
      * </p>
      * <p>
      * However the value returned by this method represents the
      * only the contexts for the particular control with which this
      * <code>IContextComputer</code> is associated.
      * </p>
      * @param event the help event which triggered this request for help
      * @return a mixed-type array of context ids (type <code>String</code>)
      * and/or help contexts (type <code>IContext</code>)
      * @see org.eclipse.help.IContext
      */
     public Object [] getLocalContexts(HelpEvent event);
 }

